DE3644676A1 - Process for producing lightweight structural parts - Google Patents

Process for producing lightweight structural parts

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Publication number
DE3644676A1
DE3644676A1 DE19863644676 DE3644676A DE3644676A1 DE 3644676 A1 DE3644676 A1 DE 3644676A1 DE 19863644676 DE19863644676 DE 19863644676 DE 3644676 A DE3644676 A DE 3644676A DE 3644676 A1 DE3644676 A1 DE 3644676A1
Authority
DE
Germany
Prior art keywords
core
jacket
honeycomb
jacket material
shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE19863644676
Other languages
German (de)
Inventor
Des Erfinders Auf Nennung Verzicht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SCHLADITZ KLAUS
Original Assignee
SCHLADITZ KLAUS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SCHLADITZ KLAUS filed Critical SCHLADITZ KLAUS
Priority to DE19863644676 priority Critical patent/DE3644676A1/en
Publication of DE3644676A1 publication Critical patent/DE3644676A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
    • B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/60—Board appendages, e.g. fins, hydrofoils or centre boards
    • B63B32/62—Board appendages, e.g. fins, hydrofoils or centre boards characterised by the material, e.g. laminated materials; characterised by their manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
    • B29L2031/5263—Skis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
    • B29L2031/5272—Surf boards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/02—Cellular or porous
    • B32B2305/024—Honeycomb
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/08—Reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2398/00—Unspecified macromolecular compounds
    • B32B2398/20—Thermoplastics

Abstract

In a process for producing lightweight structural parts (10) with a honeycomb core (12) and a shell (14') of glass fibre-reinforced thermoplastic material, the core (12) is covered on both sides with heated blanks of the shell material and is pressed into the shell by the flow moulding process. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Leichtbauteilen mit einem geschäumten, gekammerten oder wabenförmigem Kern und einem Mantel aus fasermattenver­ stärktem thermoplastischen Material, das den Kern sand­ wich- oder schalenförmig einschließt.The invention relates to a method for producing Lightweight components with a foamed, chambered or honeycomb-shaped core and a coat of fiber mat ver reinforced thermoplastic material that sand the core wich- or bowl-shaped.

Als Beispiele derartiger Leichtbauteile, bei denen es auf eine hohe Biegesteifigkeit bei möglichst geringem Gewicht ankommt, sind etwa Schwerter bzw. Finnen für Surfbretter sowie Ski, Wasserski, Snowboards und ähnlich hochbelastete Teile zu nennen.As examples of such lightweight components, where it to a high bending stiffness with the lowest possible Weight arrives, are about swords or fins for Surfboards as well as skis, water skis, snowboards and the like to name highly stressed parts.

Bei herkömmlichen Verfahren zur Herstellung derartiger Bauteile wird die Mantelschicht aus faserverstärktem Kunststoff von Hand auf einen ge­ schäumten Kern auflaminiert, oder es werden im Spritz­ gußverfahren zwei Halbschalen aus faserverstärktem Kunststoff hergestellt und nach Einlegen des Kerns miteinander verklebt.In conventional processes for the production of such components the layer of fiber reinforced plastic by hand on a ge foamed core laminated, or it is sprayed casting process two half-shells made of fiber-reinforced Made of plastic and after inserting the core glued together.

Diese Verfahren sind relativ arbeits- und zeitaufwendig und zudem aufgrund der beim Kleben oder Laminieren ent­ stehenden Lösungsmitteldämpfe mit Gesundheits- und Umweltgefahren verbunden. Bei extremer Beanspruchung weisen die nach diesen Verfahren hergestellten Erzeug­ nisse keine ausreichende Biegesteifigkeit und Schlag­ festigkeit auf.These procedures are relatively labor and time consuming and also due to ent when gluing or laminating standing solvent vapors with health and Connected to environmental hazards. With extreme stress indicate the product produced by these processes not sufficient bending stiffness and impact strength on.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Gattung anzugeben, das eine saubere und rationelle Herstellung von Leichtbauteilen mit erhöhter Biegesteifigkeit ermöglicht.The invention has for its object a method to specify the genus mentioned at the outset clean and efficient production of lightweight components with increased bending stiffness.

Diese Aufgabe wird erfindungsgemäß gelöst durch die fol­ genden Verfahrensschritte:This object is achieved by the fol  procedural steps:

  • a) ebene Zuschnitte des Mantelmaterials werden er­ wärmt,a) it will be flat blanks of the jacket material warms
  • b) der Kern wird beidseitig mit dem erwärmten Man­ telmaterial belegt und in ein Preßwerkzeug ein­ gebracht,b) the core is covered on both sides with the heated man tel material occupied and in a press tool brought,
  • c) das Mantelmaterial wird auf den Kern gepreßt.c) the jacket material is pressed onto the core.

Es ist im Prinzip bereits bekannt, glasmattenverstärkte thermoplaste (GMT) im Fließpreßverfahren zu verarbeiten. Bei dem bekannten Verfahren werden zunächst ein oder mehrere Glasmatten mittels Druck und Hitze mit dem Matrix­ material, beispielsweise Polypropylen, Polyacryl oder an­ deren Thermoplasten zu einer homogenen Halbzeugplatte ver­ bunden. Die Halbzeugplatten werden anschließend zuge­ schnitten, erwärmt und in einem Preßwerkzeug komprimiert, so daß sich das Material in alle Extremitäten des her­ zustellenden Bauteils verteilt. Nach diesem Verfahren konnten jedoch bisher nur massive GMT-Teile hergestellt werden.In principle, it is already known to be glass mat reinforced to process thermoplastics (GMT) in the extrusion process. In the known method, one or several glass mats using pressure and heat with the matrix material, for example polypropylene, polyacrylic or whose thermoplastics ver to a homogeneous semi-finished plate bound. The semi-finished panels are then fed cut, heated and compressed in a press tool, so that the material can be found in all extremities of the distributed component. According to this procedure So far, however, only massive GMT parts could be manufactured will.

Durch die Erfindung wird erstmals vorgeschlagen, das GMT-Material unmittelbar auf oder um einen Kern zu pressen. Aufgrund der gleichmäßigen Druckbeaufschlagung im Preßwerkzeug ist der Kern trotz seiner wabenförmigen oder schaumförmigen Konsistenz in der Lage, den für das Pressen des Mantelmaterials erforderlichen Gegendruck zu erzeugen. Das gepreßte GMT-Material zeichnet sich durch eine hohe Schlagzähigkeit und Biegesteifigkeit aus. Bei dem erfindungsgemäßen Verfahren wird die Biege­ steifigkeit zusätzlich dadurch erhöht, daß das Mantel­ material fest an die Oberfläche des Kerns angepreßt oder - beispielsweise bei einem wabenförmigen Kern - in die Kernoberfläche eingepreßt wird. Bei Bauteilen mit ausgeprägter räumlicher Struktur wird GMT-Material im Fließpreßverfahren aufgepreßt.The invention proposes for the first time to press the GMT material directly onto or around a core. Due to the uniform pressurization in the pressing tool, the core is able to generate the back pressure required for pressing the jacket material, despite its honeycomb or foam-like consistency. The pressed GMT material is characterized by high impact strength and bending stiffness. In the method according to the invention, the bending stiffness is additionally increased in that the jacket material is pressed firmly against the surface of the core or - for example in the case of a honeycomb-shaped core - is pressed into the core surface. For components with a pronounced spatial structure, GMT material is pressed on using the extrusion process.

Nach dem erfindungsgemäßen Verfahren können sowohl Bau­ teile mit einer sandwichartigen Schichtstruktur als auch Bauteile hergestellt werden, bei denen der Mantel den Kern in Form einer geschlossenen Hülle umgibt. Im letzteren Fall fließen bei dem Preßvorgang die Ränder der Mantel­ material-Zuschnitte ineinander, wobei die chemisch an das Matrixmaterial gebundenen Glasfasern der verschiedenen Zuschnitte sich miteinander vernetzen. Auf diese Weise wird durch das Mantelmaterial eine nahtlose, homogene und daher besonders widerstandsfähige Schale gebildet.According to the inventive method, both construction parts with a sandwich-like layer structure as well Components are made in which the jacket Surrounds core in the form of a closed shell. In the latter Fall flow the edges of the jacket during the pressing process material cuts into each other, the chemically the matrix material bound glass fibers of the different Cuts network with each other. In this way becomes a seamless, homogeneous and therefore formed a particularly resistant shell.

Bevorzugt wird der Kern, bevor er mit den Zuschnitten des Mantelmaterials belegt wird, mit einer thermoplastischen Folie umwickelt oder in eine thermoplastische Folie ein­ geschrumpft. Hierdurch wird eine feste Verbindung zwischen Kern und Mantel geschaffen und ein zu tiefes Eindringen des Mantelmaterials in die Hohlräume des Kerns verhindert. Das Mantelmaterial ist vorzugsweise durch Glasfasermatten verstärkt. Es können jedoch auch Kohlenstoffasern oder sonstige Verstärkungsmaterialien eingesetzt werden. Darüber hinaus ist es möglich, den Mantel durch Einlegeteile aus Metall oder dergleichen an bestimmten Stellen gezielt zusätzlich zu verstärken.The core is preferred before it is cut to size Sheath material is covered with a thermoplastic Film wrapped or in a thermoplastic film shrunk. This creates a firm connection created between core and mantle and too deep Penetration of the jacket material into the cavities of the Kerns prevented. The jacket material is preferred reinforced by fiberglass mats. However, it can also Carbon fibers or other reinforcing materials be used. In addition, it is possible to Sheath by insert parts made of metal or the like targeted to additionally reinforce at certain points.

Der Kern wird beispielsweise durch Polyurethanschaum, Hart-PVC-Schaum oder durch Waben aus ABS oder anderen thermoplastischen Polymeren oder aus phenolharz-getränktem Papier gebildet. Diese Kernmaterialien und das Matrixmaterial des Mantels lassen im Fließpreßverfahren wirtschaftlich und umweltfreundlich verarbeiten. Bei Verwendung von Polypropylen für den Kern, die Folie und den Mantel besteht darüber hinaus die Möglichkeit einer Wiederverwendung (Recycling).The core is covered, for example, by polyurethane foam, Hard PVC foam or honeycomb made of ABS or others thermoplastic polymers or from phenolic resin-impregnated Paper formed. These core materials and the matrix material of the jacket leave in the extrusion process economically and process in an environmentally friendly manner. When using polypropylene for the core, the film and the jacket there is above the possibility of reuse (recycling).

Im folgenden wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher erläutert.The following is a preferred embodiment  the invention with reference to the drawings.

Fig. 1 zeigt einen Schnitt durch ein nach dem erfindungsgemäßen Verfahren her­ gestelltes Schwert für ein Surfbrett; und Fig. 1 shows a section through a sword made according to the inventive method for a surfboard; and

Fig. 2 veranschaulicht einen Verfahrens­ schritt des Herstellungsverfahrens. Fig. 2 illustrates a process step of the manufacturing process.

Ein Schwert 10 für ein Surfbrett weist gemäß Fig. 1 einen Wabenkern 12 und einen homogenen, geschlossenen Mantel 14 auf. Der Wabenkern 12 wird durch eine Vielzahl paralleler dünnwandiger Rohre aus ABS-Harz gebildet, die an ihren äußeren Umfangsflächen miteinander verschweißt sind (System Tubus-Bauer). Der Mantel 14 besteht aus einem glasmatten­ verstärkten thermoplastischen Material wie Polypropylen oder dergleichen.According to FIG. 1, a sword 10 for a surfboard has a honeycomb core 12 and a homogeneous, closed jacket 14 . The honeycomb core 12 is formed by a multiplicity of parallel thin-walled tubes made of ABS resin, which are welded to one another on their outer peripheral surfaces (Tubus-Bauer system). The jacket 14 consists of a glass mat reinforced thermoplastic material such as polypropylene or the like.

Anstelle des Wabenkerns 12 kann auch ein Kern aus Struktur­ schaum, ein gitterförmiger Kern oder ein verripptes Form­ teil aus GMT oder dergleichen vorgesehen sein.Instead of the honeycomb core 12 , a core made of structural foam, a grid-shaped core or a ribbed molded part made of GMT or the like can also be provided.

Bei der Herstellung wird zunächst der Kern 12 auf eine geeignete Form zugeschnitten und in eine thermoplastische Schrumpffolie eingeschlossen. Das Mantelmaterial liegt zunächst in Form flacher homogener Halbzeugplatten aus GMT vor, die dann geeignet zugeschnitten werden. Die Zuschnitte werden in einem Durchlaufofen erwärmt, bis das Matrixmaterial flüssig wird und die Glasmatten auf­ quellen. Der in die Folie eingeschlossene Kern 12 wird beidseitig mit den heißen, biegeschlaffen Zuschnitten 14′ belegt und in ein gekühltes Preßwerkzeug 16 eingebracht (Fig. 2). Beim Schließen des Werkzeugs wird das Mantel­ material fest auf den Kern 12 aufgepreßt. Die Ränder der Zuschnitte 14, 14′ fließen dabei ineinander, so daß sich die Fasern der jeweiligen Glasmatten miteinander vernetzen und eine homogene Struktur bilden.During manufacture, the core 12 is first cut to a suitable shape and enclosed in a thermoplastic shrink film. The jacket material is initially in the form of flat, homogeneous GMT semi-finished panels, which are then cut to size. The blanks are heated in a continuous furnace until the matrix material becomes liquid and the glass mats swell. The core 12 enclosed in the film is covered on both sides with the hot, limp blanks 14 'and introduced into a cooled press tool 16 ( FIG. 2). When closing the tool, the jacket material is pressed firmly onto the core 12 . The edges of the blanks 14 , 14 'flow into one another, so that the fibers of the respective glass mats network with one another and form a homogeneous structure.

Nach diesem Verfahren lassen sich Schwerter oder Finnen für Surfbretter sowie vergleichbare Leichtbauteile mit kurzen Taktzeiten wirtschaftlich herstellen.Swords or fins can be made using this procedure for surfboards and comparable lightweight components short cycle times economically.

Claims (4)

1. Verfahren zur Herstellung von Leichtbauteilen mit einem geschäumten, gekammerten oder wabenförmigen Kern und einem Mantel aus fasermattenverstärktem thermoplastischem Material, der den Kern sandwich- oder schalenartig einschließt, ge­ kennzeichnet durch die folgenden Verfahrens­ schritte:
  • a) ebene Zuschnitte des Mantelmaterials werden erwärmt,
  • b) der Kern wird beidseitig mit dem erwärmten Mantelmaterial belegt und in ein Preßwerkzeug eingebracht,
  • c) das Mantelmaterial wird auf den Kern gepreßt.
1. Process for the production of lightweight components with a foamed, chambered or honeycomb-shaped core and a jacket made of fiber mat-reinforced thermoplastic material, which encloses the core in a sandwich or shell-like manner, characterized by the following process steps:
  • a) flat blanks of the jacket material are heated,
  • b) the core is coated on both sides with the heated jacket material and placed in a press tool,
  • c) the jacket material is pressed onto the core.
2. Verfahren nach Anspruch 1, dadurch gekenn­ zeichnet, daß der Kern aus wabenförmigem Material besteht.2. The method according to claim 1, characterized records that the core of honeycomb material consists. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekenn­ zeichnet, daß der Kern mit einer thermoplastischen Folie umhüllt wird, bevor er mit dem Mantelmaterial be­ legt wird.3. The method according to claim 1 or 2, characterized records that the core with a thermoplastic Foil is wrapped before it be with the jacket material is laid. 4. Verfahren nach Anspruch 3, dadurch gekenn­ zeichnet, daß die Folie auf den Kern aufgeschrumpft wird.4. The method according to claim 3, characterized records that the film shrunk onto the core becomes.
DE19863644676 1986-12-30 1986-12-30 Process for producing lightweight structural parts Ceased DE3644676A1 (en)

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Application Number Priority Date Filing Date Title
DE19863644676 DE3644676A1 (en) 1986-12-30 1986-12-30 Process for producing lightweight structural parts

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DE19863644676 DE3644676A1 (en) 1986-12-30 1986-12-30 Process for producing lightweight structural parts

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DE3644676A1 true DE3644676A1 (en) 1988-07-14

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0400599A2 (en) * 1989-05-30 1990-12-05 Phillips Petroleum Company Composite cellular sandwich structure
FR2686043A1 (en) * 1992-01-14 1993-07-16 Induplast Sa Method of producing a structural panel of the sandwich type, and panel thus obtained
EP0595607A1 (en) * 1992-10-27 1994-05-04 MITSUI TOATSU CHEMICALS, Inc. Composite molded article and method for making same
EP0678071A4 (en) * 1993-01-13 1995-08-25 Supracor Systems Inc Method and apparatus for masking the acoustic signature of vessels.
US5756182A (en) * 1989-12-04 1998-05-26 Supracor Systems, Inc. Method and apparatus for masking the acoustic signature of vessels
US5876534A (en) * 1995-10-04 1999-03-02 Isosport Verbundbauteile Gesellschaft M.B.H. Composite panels and process for manufacturing them
DE20016051U1 (en) * 2000-09-15 2002-02-21 Faist Automotive Gmbh & Co Kg Sound absorbing composite panel
CN106608051A (en) * 2015-10-21 2017-05-03 张成宗 Composite plate and manufacturing method thereof
CN109649573A (en) * 2018-12-31 2019-04-19 沈恒 A kind of novel hydrostatic is competed dedicated ships and light boats and paddle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1779024A1 (en) * 1968-06-28 1971-08-26 Inst Leichtbau Und Oekonomisch Process for the production of composite panels with outer layers of fiber-reinforced synthetic resins

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1779024A1 (en) * 1968-06-28 1971-08-26 Inst Leichtbau Und Oekonomisch Process for the production of composite panels with outer layers of fiber-reinforced synthetic resins

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WURTINGER, H.: Kernverbunde als tragende Konstruktionselemente In: Kunststoff- Berater 7, 1972, S. 562-569 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0400599A2 (en) * 1989-05-30 1990-12-05 Phillips Petroleum Company Composite cellular sandwich structure
EP0400599A3 (en) * 1989-05-30 1991-07-03 Phillips Petroleum Company Composite cellular sandwich structure
US5756182A (en) * 1989-12-04 1998-05-26 Supracor Systems, Inc. Method and apparatus for masking the acoustic signature of vessels
FR2686043A1 (en) * 1992-01-14 1993-07-16 Induplast Sa Method of producing a structural panel of the sandwich type, and panel thus obtained
US5725940A (en) * 1992-10-27 1998-03-10 Mitsui Toatsu Chemicals, Inc. Composite molded article and method for making same
EP0595607A1 (en) * 1992-10-27 1994-05-04 MITSUI TOATSU CHEMICALS, Inc. Composite molded article and method for making same
EP0678071A1 (en) * 1993-01-13 1995-10-25 Supracor Systems, Inc. Method and apparatus for masking the acoustic signature of vessels
EP0678071A4 (en) * 1993-01-13 1995-08-25 Supracor Systems Inc Method and apparatus for masking the acoustic signature of vessels.
US5876534A (en) * 1995-10-04 1999-03-02 Isosport Verbundbauteile Gesellschaft M.B.H. Composite panels and process for manufacturing them
AT405382B (en) * 1995-10-04 1999-07-26 Isosport Verbundbauteile METHOD FOR PRODUCING A SANDWICH PLATE AND THE USE THEREOF
DE20016051U1 (en) * 2000-09-15 2002-02-21 Faist Automotive Gmbh & Co Kg Sound absorbing composite panel
CN106608051A (en) * 2015-10-21 2017-05-03 张成宗 Composite plate and manufacturing method thereof
CN109649573A (en) * 2018-12-31 2019-04-19 沈恒 A kind of novel hydrostatic is competed dedicated ships and light boats and paddle

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